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UNITED STATES PATENT OEEicE.

MATTS SKOlV, OF OMAHA, NEBRASKA, ASSIGNOR OF TlVO-THIRDS TO LAlV- RENO/E C. ENElVOlJD AND EDlVARD PETERSON, OF SAME PLACE.

HARROW.

SPECIFICATION forming part of Letters Patent No. 397,145, dated February 5, 1889. Application filed November 14, 1887. Serial No. 255,169. (No model.)

To all whom, it may concern: brace-bar, K,pivoted at the top of the bolt in Be it known that I, MATTS SKOW, a citizen the manner similar to that of the draft-brace of the United States, residing at the city of I. The eyes L of the draft-bar and weighted Omaha, in the county of Douglas and State of arm rest one upon the other, and both bear Nebraska, have invented a certain new and upon the central seat, M. N represents a 5 5 useful Improvement in Agricultural Implethin curved bar secured rigidly to and rotatments known as Harrows; and I do declare ing with the draft-bar. This bar N extends that the following is a full, clear, and exact around parallel with the concentric rings B, description of the invention. and its free end passes through an aperture,

10 My invention relates to rotary harrows, and O, in the weighted arm J, and the latter is 90 is especially designed as an improvement on locked at various angles to this bar by the those harrows in which a laterally-extending set-screw P. It will be observed that the bar arm is provided with a weight; arranged to does not form a complete circle, but is abbreoverhang and bear down one side of the toothviated, being merely semicircular, which conframe,-so that the teeth of the latter will more struction is for the purpose of saving mateforcibly engage the earth upon one side than rial. The weight \V upon the free end of the upon the other, whereby the frame is caused regulating-arm is provided with a hole, Q, to rotate as it advances. through which the arm passes, so that it can The object of. my invention is to provide be adjusted nearer to or farther from the cen- 20 improved means for supporting and adjustter of the machine, for the purpose which ing the angle of the weighted arm, whereby will be presently mentioned. The thumbthe construction and operation of the mechscrew R upon the top of the weight enables anism can be made superior to those hitherto the latter to be locked at any desired point in use. upon the arm.

25 \Vith these ends in view my invention con- The top of the center bolt, H, to which the sists in the peculiar features more fully dedraft-bar and regulating-arm are pivoted, is scribed hereinafter, and pointed out in the provided with a screw-thread which receives claim. the nut S for locking these two parts down Referring to the accompanying drawings, upon thebolt. It will thus be apparent that 30 Figure 1 represents a plan of my complete when the plane of the arm is set at an angle to device, and Fig. 2 a side elevation of the the path or direction in which the machine is same. moving the center of gravity will lie between The main frame A of the harrow is circuthe central axis of the rotating frame and lar in general outline, and is composed of a cause the weight to preponderate upon that c 5 series of concentric rings, B, to the under side side of the machine. Consequently the teeth of which are secured thelattice-bars C. These upon the weighted side are made to penetrate bars are arranged at right angles to each deeper into theearth and rotate the framejn other, and at their points of intersection are the manner well known to the art; but by my bolted together by means of the threaded special arrangement the depth penetrated by 40 shanks l) of the teeth E, which pass through the teeth, and consequent velocity with which them, and to these shanks the nuts F are apthe frame rotates, can be regulated to the utplicd, and the frame thus rigidly secured tomost nicety. \Vhen the adj ustable weight \V gether. This construction being well known, is placed a considerable distance out upon the it will not require further des("ription. arm .l and the latter is locked at right angles 45 The draft-bar G is pivoted to the center to the draft-bar, as shown in Fig. 1, then the bolt, H, and the brace-bar I, which is also teeth will penetrate deeply into the soil and pivoted to the center bolt, holds the draft-bar rotate the harrow at a greater velocity; but rigidly in place and prevents undue wearand when it is desired to diminish the depth at strain. The weighted arm J is also pivoted which the teeth penetrate the curved bar N 50 to the central bolt, ll, and provided with a can be unlocked and swung around to a less angular position, as shown in dotted lines in said pivot, brace-bars rig-idly secured to the Fig. 1, and it not adjusted to the proper penedraft-bar and weighted arm, respectively, and tration the weight can he moved a suitable pivoted to the central pivot, a semicircular distance haek'ward or forward upon the arm J. bar rigidly secured to thedrat't-bar and in en- 20 5 The :ulvantages of this arrangement over gagement with the weighted arm, and a set these t'ormerty in use are that the degree of screw for loeking the seinieirmllar lhLl to the penetration of the teeth can be regulated to weighted arm, all arranged and adapted to suit the strength of the animal drawing it, I operate SulJStantiaIly as described. the kind of grain sown, the soil aeted upon, Dated at Omaha, in the county of III)ouy,-las 25 10 or, in t'aet, any oi. the exigencies of the case. i and State of Nebraska, this 1th day of No- [Iaving thus described my invention, what I veinher, A. D. 1887. Lelain as new, and desiretoseeure by Letters MATTS SKOV.

l atent, 15-

/ \Vilnesses:

(l-ms. GEORGE, i I H. 'WADDINGHML.

The emnhination, in a roiar harrow, of a I rotary lfraine )rovided with a ventral )lYUt a draft-bar and \velghted arm (entered upon 

